luci-base: fix luci-base host tool install on OpenWrt
luci-base: fix luci-base host tool install on OpenWrt

OpenWrt doesn't provide an argument to Host/Install like LEDE does; use
HOST_BUILD_PREFIX instead, which is available on both.

Signed-off-by: Matthias Schiffer <395a7f4bbde6f966d487d8a78f2e1bfb705b6a74@universe-factory.net>

chris5560/openwrt-luci,cshore/luci,Wedmer/luci,rogerpueyo/luci,Noltari/luci,taiha/luci,cshore-firmware/openwrt-luci,aa65535/luci,981213/luci-1,cshore-firmware/openwrt-luci,oneru/luci,artynet/luci,rogerpueyo/luci,LuttyYang/luci,daofeng2015/luci,openwrt-es/openwrt-luci,LuttyYang/luci,openwrt/luci,cshore/luci,oneru/luci,Noltari/luci,daofeng2015/luci,daofeng2015/luci,mumuqz/luci,artynet/luci,wongsyrone/luci-1,cshore-firmware/openwrt-luci,bittorf/luci,artynet/luci,taiha/luci,teslamint/luci,wongsyrone/luci-1,wongsyrone/luci-1,kuoruan/luci,kuoruan/luci,remakeelectric/luci,cshore-firmware/openwrt-luci,chris5560/openwrt-luci,artynet/luci,openwrt-es/openwrt-luci,nmav/luci,lbthomsen/openwrt-luci,openwrt/luci,bittorf/luci,nmav/luci,kuoruan/luci,lbthomsen/openwrt-luci,mumuqz/luci,981213/luci-1,tobiaswaldvogel/luci,Wedmer/luci,wongsyrone/luci-1,chris5560/openwrt-luci,wongsyrone/luci-1,oneru/luci,aa65535/luci,kuoruan/lede-luci,remakeelectric/luci,hnyman/luci,chris5560/openwrt-luci,kuoruan/lede-luci,artynet/luci,Noltari/luci,wongsyrone/luci-1,aa65535/luci,Wedmer/luci,hnyman/luci,remakeelectric/luci,nmav/luci,chris5560/openwrt-luci,981213/luci-1,nmav/luci,oneru/luci,teslamint/luci,wongsyrone/luci-1,kuoruan/luci,mumuqz/luci,teslamint/luci,tobiaswaldvogel/luci,shangjiyu/luci-with-extra,remakeelectric/luci,daofeng2015/luci,cshore-firmware/openwrt-luci,nmav/luci,daofeng2015/luci,cshore-firmware/openwrt-luci,taiha/luci,oneru/luci,Wedmer/luci,taiha/luci,openwrt/luci,shangjiyu/luci-with-extra,teslamint/luci,oneru/luci,openwrt-es/openwrt-luci,nmav/luci,cshore/luci,kuoruan/luci,Wedmer/luci,nmav/luci,daofeng2015/luci,mumuqz/luci,981213/luci-1,kuoruan/lede-luci,rogerpueyo/luci,bittorf/luci,remakeelectric/luci,taiha/luci,bittorf/luci,tobiaswaldvogel/luci,kuoruan/lede-luci,aa65535/luci,mumuqz/luci,cshore-firmware/openwrt-luci,taiha/luci,taiha/luci,hnyman/luci,chris5560/openwrt-luci,artynet/luci,teslamint/luci,shangjiyu/luci-with-extra,shangjiyu/luci-with-extra,openwrt-es/openwrt-luci,cshore/luci,mumuqz/luci,tobiaswaldvogel/luci,oneru/luci,kuoruan/luci,Noltari/luci,Wedmer/luci,aa65535/luci,lbthomsen/openwrt-luci,lbthomsen/openwrt-luci,kuoruan/lede-luci,artynet/luci,chris5560/openwrt-luci,LuttyYang/luci,taiha/luci,openwrt/luci,tobiaswaldvogel/luci,openwrt-es/openwrt-luci,rogerpueyo/luci,openwrt/luci,lbthomsen/openwrt-luci,LuttyYang/luci,tobiaswaldvogel/luci,LuttyYang/luci,Wedmer/luci,bittorf/luci,rogerpueyo/luci,shangjiyu/luci-with-extra,rogerpueyo/luci,Noltari/luci,cshore/luci,nmav/luci,hnyman/luci,lbthomsen/openwrt-luci,bittorf/luci,lbthomsen/openwrt-luci,LuttyYang/luci,teslamint/luci,oneru/luci,hnyman/luci,daofeng2015/luci,aa65535/luci,openwrt/luci,hnyman/luci,openwrt/luci,kuoruan/lede-luci,openwrt-es/openwrt-luci,cshore/luci,lbthomsen/openwrt-luci,wongsyrone/luci-1,hnyman/luci,artynet/luci,nmav/luci,cshore/luci,kuoruan/luci,981213/luci-1,chris5560/openwrt-luci,bittorf/luci,rogerpueyo/luci,981213/luci-1,tobiaswaldvogel/luci,shangjiyu/luci-with-extra,LuttyYang/luci,Noltari/luci,shangjiyu/luci-with-extra,981213/luci-1,teslamint/luci,Noltari/luci,remakeelectric/luci,Wedmer/luci,kuoruan/luci,openwrt-es/openwrt-luci,aa65535/luci,LuttyYang/luci,Noltari/luci,cshore-firmware/openwrt-luci,tobiaswaldvogel/luci,aa65535/luci,teslamint/luci,Noltari/luci,kuoruan/lede-luci,mumuqz/luci,cshore/luci,bittorf/luci,openwrt/luci,shangjiyu/luci-with-extra,daofeng2015/luci,openwrt-es/openwrt-luci,artynet/luci,remakeelectric/luci,rogerpueyo/luci,mumuqz/luci,hnyman/luci,kuoruan/lede-luci,remakeelectric/luci